>> reporter: but asked about the general, the president didn't bite. >> any regrets about michael flynn. >> thank you very much. >> now flynn's lawyer is still insisting that he did brief the pentagon before and after that 2015 trip to moscow. but the pentagon says they have looked through their records and they have found no evidence that flynn asked for approval, or disclosed that he received thousands of dollars. mary bruce, abc news, capitol hill. china has reportedly given north korea an ultimatum. in an interview with fox news, secretary of state rex tillerson says china told north korea to stop conducting nuclear tests or face chinese sanctions. tillerson said the u.s. is asking a lot of the chinese, but, says their help is critical to address the nuclear threat. he also stressed the u.s. is not seeking a regime change. and would be open to direct talks if north korea is willing to give up nuclear weapons. president trump says he, too, prefers diplomacy to resolve the north korean crisis, but warns what he calls a major, major conflict is possible.